7a,11a-epoxy-4-hydroxy-7,7a,8,9,10,11,11a,12-octahydro-phthalazino[2,3-b]phthalazine-5,14-dione 在
sodium hydroxide 作用下,
生成 8a-hydroxy-5-oxo-(8a
c)-8,8a,9,10,11,12-hexahydro-5
H,7
H-7,12a
r-methano-dibenzo[
b,
h][1,5,6]oxadiazonine-4-carboxylic acid