39978-51-3 BRN 1335821 DL-Tyrosine, N-(2-furanylcarbonyl)-, (3-(5-nitro-2-furanyl)-2-propenylidene)hydrazide N(sup 1)-(N'-2'-Furonyl(+-)tyrosyl)-N(sup 2)-(5'-nitro-2-furylacrylidone)hydrazine