1-Morpholinocyclopentene 4-(1-Cyclopenten-1-yl)morpholine 4-(1-Cyclopentenyl)morpholine 936-52-7 Cyclopentanone morpholine enamine Morpholine, 4-(1-cyclopenten-1-yl)- N-(1-Cyclopenten-1-yl)-morpholine NSC86131 WLN: T6N DOTJ A- AL5UTJ