Synonyms: Pyrano[3,2-c][2]benzopyran-6(2H)-one,3,4,4a,10b-tetrahydro-3,4,8,10-tetrahydroxy-2-(hydroxymethyl)-9-methoxy-,monohydrate, (2R,3S,4S,4aR,10bS)- (9CI); Pyrano[3,2-c][2]benzopyran-6(2H)-one,3,4,4a,10b-tetrahydro-3,4,8,10-tetrahydroxy-2-(hydroxymethyl)-9-methoxy-,monohydrate, [2R-(2a,3b,4a,4aa,10bb)]-; Bergenin monohydrate