(3'S)-1'-(1,1-DIMETHYLETHYL)-1',2',5,7-TETRAHYDRO-2'-OXOSPIRO(6H-CYCLOPENTA(B)PYRIDINE-6,3'-(3H)PYRROLO(2,3-B)PYRIDINE)-3-CARBOXYLIC ACID
(3's)-1'-(1,1-dimethylethyl)-1',2',5,7-tetrahydro-2'-oxospiro(6h-cyclopenta(b)pyridine-6,3'-(3h)pyrrolo(2,3-b)pyridine)-3-carboxylic acid