SEARCH Articles Figures Tables 1- -2-methyl-4-nitro 2- -4-methyl- -ethylester 2-Ethyl-3-methyl-2- 3-nitro- -ethylester 3- - -ethylester 3- -2-nitro- -ethyleste 3- -2-nitro- -ethylester 4-Methyl-5- -4-nitro- -ethyleste 4-Methyl-5- -4-nitro- -ethyleste