preferred_name: (4R,4aS,8aR,9aS,15aR,17aR)-15a,16-Dihydroxy-12-methyl-10,14,15,17-tetraoxo-4,4a,8a,9,9a,10,13,14,15,15a,17,17a-dodecahydro-1H-chromeno(2',3':6,7)(1,3)dioxino(4',5',6':4,5)naphtho(2,1-g)isoquinolin-4-y l (2E,4E,6E)-2,4,6-octatrienoate