8-methoxy-6-ethoxycarbonyl-3,4-dihydrocarbostyril 以
甲醇 为溶剂,
以in the same manner as in Reference Example 10, 0.75 g of 8-methoxy-6-carboxy-3,4-dihydrocarbostyril was obtained as colorless needle-like crystals (recrystallized from methanol)的产率得到8-methoxy-6-carboxy-3,4-dihydrocarbostyril