乙酸酐 、
ent-2α,3α,10β-trihydroxy-20-norgibberell-16-ene-7,19-dioic acid-19,10-lactone-2-O-β-D-glucopyranoside 在
吡啶 作用下,
生成 ent-3α-acetoxy-2α,10β-trihydroxy-20-norgibberell-16-ene-7,19-dioic acid-19,10-lactone-2',3',4',6'-tetra-O-acetyl-2-O-β-D-dlucopyranoside