1a) chemical formula : C5H9N3 1b) 1c) 2a) C16H21N3 b) The ethylamine moiety of the antihistamine is able to interact with the histamine receptor competitively and block the site of histamine binding. 3) Drugs that produces a psychological response : Aspirin, Morphine, Estrogen, Amphetamine    Drugs that inhibit growth of substance that cause infection :(Keflex) antibiotics, Penicillin   4a) The herbal supplement manufacturers should be details of the supplement on the packaging. b) The legislation available in Singapore is the HSA […]