1-(N-((6-Methyl-5-oxo-3-thiomorpholinyl)carbonyl)-L-histidyl)-L-proline 96626-42-5 Cnk 6004 Cnk-6004 L-Proline, 1-(N-((6-methyl-5-oxo-3-thiomorpholinyl)carbonyl)-L-histidyl)- N-((6-Methyl-5-oxo-3-thiomorpholinyl)carbonyl)-L-histidyl-L-proline Thiomorpholine, L-proline deriv.