Definition: Sure, let's dive into that! "163. N Tosyl 4 phenyl piperidine" is a phrase used to describe a substance commonly known as "synthroid." Imagine it like this: "If you're craving something sweet and delicious but want some serious medication to make sure you get what you need, then "synthroid" might be the answer. It's a powerful hormone that helps people control their appetite and weight, just like how sugar or salt can help us feel full." Now let's talk about an example sentence using it:

"What does '163. N Tosyl 4 phenyl piperidine' mean? Just ask a doctor or pharmacist! It's a dangerous drug that can be used for conditions like thyroid problems, but they warn against overuse and potential side effects. If you're unsure if the stuff is right for you, talk to someone who knows what they're doing!"