2-甲基-5-硝基苯甲酸甲酯 CAS:77324-87-9 含 量:≥99% 外观:类白色或微黄色结晶粉末 Methyl 2-Methyl-5-Nitrobenzoate Specification:≥98% CAS:77324-87-9 Appearance:White or yellowish crystal powder