The molecule is an aza-steroid that is 17-oxoestra-1,3,5(10)-triene-3-carboxylic acid in which the carbon at position 4 in the A-ring has been replaced by a nitrogen. An abiotic metabolite in the 4,5-seco pathway of aerobic estrogen degradation by the bacterium Sphingomonas sp. strain KC8. It has a role as a bacterial metabolite. It is an aza-steroid, a steroid acid and a 17-oxo steroid. It is a conjugate acid of a pyridinestrone-3-carboxylate.
(3aS,3bR,9bS,11aS)-11a-methyl-1-oxo-3,3a,3b,4,5,9b,10,11-octahydro-2H-indeno[5,4-f]quinoline-7-carboxylic acid