Chemical Name: (S)-2-(4-(8-Amino-3-(1-(but-2-ynoyl)pyrrolidin-2-yl)imidazo[1,5-a]pyrazin-1-yl)benzamido)pyridine 1-oxide
Synonym: 7β-(hydroxymethyl)-3-oxo-15α,16α-dihydro-3′H-cyclopropa[15,16]-17α-pregn-4-ene-21,17-carbolactone (7β-hydroxymethyl derivative),