China 8-Amino-4-Oxo-2- (tetrazol-5-yl) -4h-1-Benzopyran (CAS# 110683-22-2), Find details about China Pranlukast Intermediate, Pranlukast from 8-Amino-4-Oxo-2- (tetrazol-5-yl) -4h-1-Benzopyran (CAS# 110683-22-2)