[(1S,2R,3S,6S,7S,9R,10S,11S,12R,13S,14R)-2,6,9,11,13,14-Hexahydroxy-3,7,10-trimethyl-11-propan-2-yl-15-oxapentacyclo[7.5.1.01,6.07,13.010,14]pentadecan-12-yl] 1H-pyrrole-2-carboxylate 生成 [(1S,2R,3S,6S,7S,9R,10S,11S,12R,13S,14R)-2,6,9,11,13,14-hexahydroxy-3,7,10-trimethyl-11-propan-2-yl-15-oxapentacyclo[7.5.1.01,6.07,13.010,14]pentadecan-12-yl] 3,4,5-tribromo-1H-pyrrole-2-carboxylate