2-amino-5-chloro-3-methylbenzoic acid cas 20776-67-4 chemical raw material chloroxylenol pcmx 436095-87-3 (chloro-acetic acid n '-(2-p-tolyloxy-acetyl) [(2-chloro-4-fluorophenyl)methyl]hydrazine dihydrochloride plant hormone 98%tc 2-(3-chlorophenoxy)propionic acid