Analogues are drugs that have close structural resemblance and similar effects. For instance one could argue that naproxen (Aleve) is an analog of ibuprofen (Motrin/Advil). Most analogues are designed because true synthetic natural products are hard to make, or are not potent enough.
Definition of several. 1a : separate or distinct from one another federal union of the several statesb (1) : individually owned or controlled : exclusive a several fishery â compare common (2) : of or relating separately to each individual involved a several judgmentc : being separate and distinctive : respective specialists in their several fields.
1 (a.) Not divided, or not to be divided; existing as one entity, or distinct being or object; single; one; as, an individual man, animal, or city. ( 2 n.) A single person, animal, or thing of any kind; a thing or being incapable of separation or division, without losing its identity; especially, a human being; a person.