Hydroxychloroquine Sulphate

https://pubchem.ncbi.nlm.nih.gov/compound/Hydroxychloroquine-sulfate

has all the key elements, including the Functional Groups.

i suspect all B Vitamin have a similar structure.

Thiamin, also known as vitamin B 1 (or thiamine), is a heterocyclic compound that contains a thiazole ring, which is a five-membered ring made up of one sulfur atom, one nitrogen atom, and three carbon atoms.

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https://en.m.wikipedia.org/wiki/Imidazothiazole