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Okay, I need to define this compound: '502650. (R) Ethyl3 amino 3 (3,5 dichlorophenyl)propanoate; 748132 67 4'. Hmm, let's break it down step by step. First, the name seems like a chemical compound, possibly an organic molecule. The presence of "ethyl", "amino", and "(3,5 dichlorophenyl)" suggests it's an ester or amine derivative. The numbers in parentheses often indicate stereochemistry, so (R) configuration somewhere. Breaking down the parts: "Ethyl3 amino" might refer to a propanoic acid backbone. Propanoate is CH3CH2COO-. Then there's an amino group and a 3,5 dichlorophenyl ring attached. Wait, maybe it's N-ethyl-N-(3,5-dichlorophenyl)amino? So the amine part has both ethyl and phenyl substituents. Wait, "Ethyl3" could mean three carbons from ethyl? No, ethyl is two carbons. Maybe "Ethyl3" refers to a propionamide structure where the amino group is on the third carbon. Alternatively, perhaps it's an ester of 3-aminopropionic acid. But then there's also the dichlorophenyl part. Alternatively, maybe the compound is (3-chloro-4-chlorophenyl)propanoic acid ethyl amide? Not sure. Let me think about IUPAC nomenclature rules. The name seems a bit non-standard. Let's parse it again. The base structure: "Ethyl3 amino 3" might indicate that the propanoate is attached to an amino group, and there's an ethyl substituent on the third carbon? Or maybe it's N-ethyl-N-(3,5 dichlorophenyl)amino propionate? Wait, (R) suggests absolute configuration at a chiral center. So there must be a single stereocenter here. Let's reconstruct the molecule. Propanoic acid is CH3CH2COOH. If there's an amino group on the third carbon? Wait, but propanoate ester would be R-O-C(=O)-CH2CH2 or maybe C6H5... Hmm. Alternatively, perhaps it's N-ethyl-N-(3,5 dichlorophenyl) amide of propionic acid. Wait, "Ethyl3 amino" might mean that the amino group is on carbon 3 of a three-carbon chain? But propanoate is two carbons (propanoic acid is C3). So maybe it's N-propionalin...? Not sure. Alternatively, perhaps the structure is an amide where the nitrogen has an ethyl and a 3,5 dichlorophenyl group. Wait, let's look at the parts again: "Ethyl3 amino" could be interpreted as having an ethyl group on carbon 3 and an amino group also attached there? But propanoate would have three carbons. Let's consider that the amide is formed from propionic acid (propanoic acid), so R-CO-NH-. Then, substituents: maybe one substituent is ethyl and another is 3,5 dichlorophenyl on the nitrogen. So putting it together: N-(ethyl)-N-(3,5 dichlorophenyl) propanamide. Wait, but that would require two amine groups? Or perhaps it's a single amino group with both ethyl and phenyl substituents. Alternatively, maybe the molecule is (3-chloro-4-chlorophenyl)-propanoic acid ethyl ammonium salt? Alternatively, considering "502650" might be a CAS number or some internal code, but that's probably not relevant here. Wait, perhaps breaking down the name: "(R) Ethyl3 amino 3 (3,5 dichlorophenyl)propanoate". The numbers in brackets might indicate positions. So on carbon 3 of the propanoate chain, there's an amino group and a 3,5 dichlorophenyl substituent? But how? Alternatively, maybe it's N-(ethyl)-3-((3,5 dichlorophenyl)amino)propane-1-carboxylic acid. That could make sense: the carboxylic acid is on carbon 1 (since propanoate usually has three carbons), then amino group on carbon 3? Wait, but "ethyl3" would be confusing. Alternatively, maybe it's an ester rather than an amide. So ethyl (propanoyl) O-(amino-3-propyl?) with dichlorophenyl. Not sure. Wait, perhaps the correct structure is N-[(3-chloro-4-chlorophenyl)methyl]N-ethyl propanamide? That would mean a propanamide where the nitrogen has an ethyl group and a (3-chloro-4-chlorophenyl) methyl group. But that might not fit the name. Alternatively, maybe it's N-(3-propionyloxypropyl)-something? Not sure. Alternatively, let's consider similar compounds. For example, something like 2-methylbenzamide is benzamide with a methyl on carbon 2. So perhaps here, propanoyl chloride reacting with two amines: ethylamine and 3,5 dichlorophenylamine. But that would form an ammonium salt. Alternatively, maybe the compound is (R)-N-ethyl-N-(3-chloro-4-methylphenyl)propionamide. Wait, but the original name says 3,5 dichloro phenyl. So substituents at positions 3 and 5 on a benzene ring relative to some reference point. Assuming the parent structure is propanamide (N-propionamido), then substituting the amide nitrogen with an ethyl group and a 3,5 dichlorophenyl group. Wait, but that would require two substituents on the same nitrogen? That seems unlikely unless there's some ambiguity in naming. Alternatively, perhaps it's a mixture of N-ethyl-N-(3,5 dichlorophenyl) propanamide and maybe another isomer, but that's probably not. Wait, let's look at the parts again: "Ethyl3 amino 3 (3,5 dichlorophenyl)propanoate". The numbers in brackets might indicate substituent positions on the parent chain. So if the parent is a three-carbon propanoic acid derivative, maybe ester or amide. If it's an amide: N-(ethyl)-N-(3,5 dichlorophenyl) propanamide? But that would imply two amino groups attached to the same nitrogen, which isn't typical unless there's some ambiguity in naming. Alternatively, perhaps a single amino group with both ethyl and phenyl substituents. Alternatively, maybe it's (R)-N-ethyl-N-(3-chloro-4-chlorophenyl) propanamide? But 3,5 dichloro would mean two chlorines at positions 3 and 5 relative to the ring. Wait, but in benzene rings, numbering starts from one substituent as position 1. So if there's a phenyl
