Assertion: estrone | /r/HasProperty | occurring estrane steroid
Facets:
value: naturally
type: MANNER
Source sentences:
text: Estrone, also known as estra-1,3,5(10)-trien-3-ol-17-one, is a naturally occurring estrane steroid with double bonds at the C1, C3, and C5 positions, a hydroxyl group at the C3 position, and a ketone group at the C17 position.