1H-tetrazole, 5-[(2E)-2-butenylidene]-4,5-dihydro-1,4-dimethyl- 5-[(2E)-but-2-en-1-ylidene]-1,4-dimethyl-4,5-dihydro-1H-tetrazole InChI=1/C7H12N4/c1-4-5-6-7-10(2)8-9-11(7)3/h4-6H,1-3H3/b5-4