Metsulfuron-methyl Biochemistry Branched chain amino acid synthesis (ALS or AHAS) inhibitor. Acts by inhibiting biosynthesis of Metsulfuron-methylProperties: Appearance: pure product is colorless crystal ( industrial product is off white solid,with ester odor).Melting point 158,Vapour pressure3.3×10-7mPa(25) KowlogP=1.74(PH=7)Density1.47,Solubility 25, water 2.79g/L(PH7).20 xylene 0.58g/L,ethanol ...