Kay, A. W. published the artcileThe action of atropine and hexamethonium in combination on gastric secretion and motility, Related Products of bromides-buliding-blocks, the publication is British Journal of Pharmacology and Chemotherapy (1956), 231-5, database is CAplus and MEDLINE.
Hexamethonium or atropine administered singly had less effect on human gastric secretion and motility than their combination in half the single dose. Such combinations produced fewer side effects than either drug alone.
British Journal of Pharmacology and Chemotherapy published new progress about 518-67-2. 518-67-2 belongs to bromides-buliding-blocks, auxiliary class Other Aromatic Heterocyclic,Salt,Amine,Benzene, name is Dimidium bromide, and the molecular formula is C20H18BrN3, Related Products of bromides-buliding-blocks.
Referemce:
https://en.wikipedia.org/wiki/Bromide,
bromide – Wiktionary