timoprazole timoprazole timoprazole is in a class of medications called proton pump inhibitors (ppi) that inhibit gastric acid secretion. while it has never come to market, it was studied early on and is considered to be the "backbone" of the ppi class that succeeded it. this medication has high anti-secretory activity, which flared interest along with its simple structure. timoprazoleidentifiers iupac name 2--1h-benzimidazole cas number57237-97-5 ypubchem cid72171chemspider65144 yunii95h6s1x9cckeggd05900chemical and physical dataformulac13h11n3osmolar mass257.31 g·mol−13d model (jsmol)interactive image smiles n1ccccc1cs(=o)c2c3ccccc3n2 inchi inchi=1s/c13h11n3os/c17-18(9-10-5-3-4-8-14-10)13-15-11-6-1-2-7-12(11)16-13/h1-8h,9h2,(h,15,16) ykey:hbdkfzndmvlshm-uhfffaoysa-n y ny (what is this?) (verify)