聚合甲醛 、
(20S)-20-benzyl-8,25-dichloro-12-oxa-1,4,18,21,23-pentazatricyclo[20.3.1.06,11]hexacosa-6(11),7,9,22,24-pentaene-3,26-dione 在
三乙酰氧基硼氢化钠 作用下,
生成 (20S)-20-benzyl-8,25-dichloro-18-methyl-12-oxa-1,4,18,21,23-pentazatricyclo[20.3.1.06,11]hexacosa-6(11),7,9,22,24-pentaene-3,26-dione