13013-02-0 4-02-00-00840 (Beilstein Handbook Reference) 4-Nitrobutyric acid methyl ester BRN 1766154 BUTYRIC ACID, 4-NITRO-, METHYL ESTER Butanoic acid, 4-nitro-, methyl ester (9CI) EINECS 235-866-0 Methyl 4-nitrobutyrate NSC 126459