phenylazo-formaldehyde-oxime

1,3,5-trioxido-1,3,5-triazine-1,3,5-triium

diethyl 1,2,5-oxadiazole-3,4-dicarboxylate 2-oxide

3,4-diacetylfuroxan dioxime

(Z)-3-methyl-4-oximinoisoxazol-5(4H)-one