Cassaidine has been converted into cassaine by way of bisdehydro-cassaidine. Both cassaine and bisdehydro-cassaidine are reduced to cassaidine by sodium borohydride. The ring A hydroxyl group of cassaic acid can therefore be assigned 3β equatorial configuration.
酪assa已通过双脱氢-酪assa的方式转化为酪assa。
硼氢化钠将c碱和双脱氢c碱都还原为c碱。因此,可以为卡萨酸的环A羟基分配3β赤道构型。