Methyl 5-(2,4-dichlorophenoxy)-2-nitrobenzoate ,its CAS NO. is 42576-02-3,the synonyms is Mc-4379 ; Fox ; Bifenox ; Modown ; Modown(r) ; Tolkan ; 2,4-dichlorophenyl 3-methoxycarbonyl-4-nitrophenyl ether .