2-Hydroxy-4-ethyl-2,3-dimethyl delta 3-pyrroline-5-one 2-Hydroxyhemopyrroline-5-one 2H-Pyrrol-2-one, 3-ethyl-1,5-dihydro-5-hydroxy-4,5-dimethyl- 3-Ethyl-5-hydroxy-4,5-dimethyl delta(3)-pyrrolin-2-one 3-Ethyl-5-hydroxy-4,5-dimethyl-pyrrolin-2-one 4,5-Dimethyl-3-ethyl-5-hydroxy-3-pyrrolin-2-one 53573-42-5 HHP lactam Hydroxyhemopyrrolin-2-one Hydroxyjhaemopyrrole lactam Mauve factor alpha'-Hydroxyhemopyrrol alpha-lactam