Synonyms: 21-Oxaursane;2H-Chryseno[2,1-c]pyran, eicosahydro-1,2,4a,6a,6b,9,9,12a-octamethyl-, [1R-(1a,2b,4aa,6ab,6ba,8ab,12aa,12bb,14aa,14ba)]-; [1R-(1a,2b,4aa,6ab,6ba,8ab,12aa,12bb,14aa,14ba)]-Eicosahydro-1,2,4a,6a,6b,9,9,12a-octamethyl-2H-chryseno[2,1-c]pyran