1,2,3-trimethyl-4-methylidenecyclobutene

1,2,3-trimethylcyclopropene

2,3-dimethylcycloprop-2-ene-1-carboxylic acid

2,7-dimethylphenazine

N-(p-tolyl)-N'-[3-(phenylthio)but-2-en-2-yl]acetamidine