👉 It's a benzene with the formula CH3CH(2)CH(2)CH(3)-1,2-dienyl ether. It has an octet number 1087 and contains one nitrogen atom in the 5th position of the alkene bond. 1087. 1-ethynyl-2-(2-methylprop-1-en-1-yl)benzene; 819871-78-8