Name  Cialis
Synonyms  (6R,12aR)-6-(1,3-Benzodioxol-5-yl)-2,3,6,7,12,12a-hexahydro-2-methyl-pyrazino[1',2':1,6]pyrido[3,4-b]indole-1,4-dione; Tadalafil
Molecular Formula  C22H19N3O4
Molecular Weight  389.40
CAS Registry Number  171596-29-5