Piperonylic acid
5-(2H-benzo[3,4-d]1,3-dioxolen-5-yl)-3-(4-nitrophenyl)-1,3,4-thiadiazolin-2-imine
5-(2H-benzo[3,4-d]1,3-dioxolen-5-yl)-2-(azanitrosomethylene)-3-(4-nitrophenyl)-1,3,4-thiadiazoline
5-(2H-benzo[3,4-d]1,3-dioxolen-5-yl)-3-(4-nitrophenyl)-1,3,4-selenadiazolin-2-imine
5-(2H-benzo[3,4-d]1,3-dioxolen-5-yl)-2-(azanitrosomethylene)-3-(4-nitrophenyl)-1,3,4-selenadiazoline