(3Z)-N-ethyl-2-oxo-3-[[[4-(piperidin-1-ylmethyl)phenyl]amino]methylidene]-1H-indole-6-carboxamide (3Z)-N-ethyl-2-oxo-3-[[[4-(1-piperidylmethyl)phenyl]amino]methylene]indoline-6-carboxamide (3Z)-N-ethyl-2-oxo-3-[[[4-(1-piperidylmethyl)phenyl]amino]methylene]-6-indolinecarboxamide (3Z)-N-ethyl-2-keto-3-[[[4-(piperidinomethyl)phenyl]amino]methylene]indoline-6-carboxamide