impromidine impromidine impromidine (inn) is a highly potent and specific histamine h2 receptor agonist. impromidineclinical dataatc codenoneidentifiers iupac name 2--1-ethyl]guanidine cas number55273-05-7 ypubchem cid41376iuphar/bps1226chemspider37757 nunii931l4x5wmmchemblchembl12608 ncomptox dashboard (epa)dtxsid90203780 chemical and physical dataformulac14h23n7smolar mass321.45 g·mol−13d model (jsmol)interactive image smiles cc1cnc1csccnc(=n)ncccc2ccn2 inchi inchi=1s/c14h23n7s/c1-11-13(21-10-19-11)8-22-6-5-18-14(15)17-4-2-3-12-7-16-9-20-12/h7,9-10h,2-6,8h2,1h3,(h,16,20)(h,19,21)(h3,15,17,18) nkey:murragmmnaylna-uhfffaoysa-n n ny (what is this?) (verify) it has been used diagnostically as a gastric secretion indicator.