(3Z)-3-[(2E,6R,8E,10E,12E)-1-hydroxy-6,8,10,12-tetramethyltetradeca-2,8,10,12-tetraen-1-ylidene]-5-(2-methylpropyl)-2,3-dihydro-1H-pyrrol-2-one
(3z)-3-[(2e,6r,8e,10e,12e)-1-hydroxy-6,8,10,12-tetramethyltetradeca-2,8,10,12-tetraen-1-ylidene]-5-(2-methylpropyl)-2,3-dihydro-1h-pyrrol-2-one
Compound 3 in ref.