This might be a very common mainstream question for students, there are answers on the web available, but I still wanted to ask someone here: what is the difference between an inhibitor and an antagonist? (Can we just for this purpose omit the difference between enzymes and receptors as targets and just talk about a general target?) Also very important, are either inhibitors or antagonists necessarily allosteric?
One another thing: in one task, I'm asked to identify or suggest the structure of the drug for which the two metabolites are known and identified (pic in the attachment). The transformation takes two steps. How do I solve that one??