(7
R)-12
anti-hydroxy-8
t-hydroxymethyl-7,8-dihydro-3
H-7
r,10
c-methano-[1,5,3]oxathiazepino[3,4-
e]purin-4-one 、
苯甲酰氯 在
吡啶 作用下,
生成
(7S)-12anti-benzoyloxy-8t-benzoyloxymethyl-7,8-dihydro-3H-7r,10c-methano-[1,5,3]oxathiazepino[3,4-e]purin-4-one