4-氯-3-甲基苯甲酸 CAS:7697-29-2 含量:>98% 水份:≤0.5% 外观:类白色或浅红色粉末 4-Chloro-3-Methylbenzoic acid CAS: 7697-29-2 Specification:>98% Moisture:>0.5% Appearance: White or reddish crystal powder