famotidine (PepcidAC)
I believe the molecule is famotidine. It is an active ingredient
in Pepcid AC.
Pepcid AC® (famotidine) is used for treatment of stomach ailments
such as acid indigestion and gastroesophageal reflux disease.
Famotidine is a white to pale yellow crystalline compound that
is freely soluble in glacial acetic acid, slightly soluble in
methanol, very slightly soluble in water, and practically insoluble
in ethanol.
Nicole A. Hannah
http://www.merck.com/product/usa/pepcid/cns/prescribing_info/description.html