(+-)-Oxiranylmethyl 5-nitro-2-furancarboxylate 129423-12-7 2,3-Epoxypropyl-5-nitrofuran-2-carboxylate 2-Furancarboxylic acid, 5-nitro-, oxiranylmethyl ester, (+-)- RB 88706 RB-88706