Heteroaromatic annulation studies on 2-[bis(methylthio)methylene]-1-methyl-3-oxoindole: synthesis of novel heterocyclo[b] fused indoles - Kumar, U. K. Syam; Yadav, A. K.; Venkatesh, C.; Ila, H.; Junjappa, H. (ARKIVOC, 2004)
doi: 10.3998/ark.5550190.0005.804