1(2H)-Phenanthrenone, 3,4-dihydro- 1(2H)-Phenanthrone, 3,4-dihydro- 1,2,3,4-Tetrahydro-1-oxophenanthrene 1,2,3,4-Tetrahydrophenanthren-1-one 1-Oxo-1,2,3,4-tetrahydrophenanthrene 573-22-8 NSC15301