preferred_name: ((1R,2R,3R,11S,14R,26R)-5-HYDROXY-6,6'-DIMETHOXY-7,21,30-TRIMETHYL-27-OXOSPIRO(17,19,28-TRIOXA-24-THIA-13,30-DIAZAHEPTACYCLO(12.9.6.13,11.02,13.04,9.015,23.016,20)TRIACONTA-4(9),5,7,15,20,22-HEXAENE-26,1'-2,3,4,9-TETRAHYDROPYRIDO(3,4-B)INDOLE)-22-YL) ACETATE