4-oxo-3,4-dihydroquinazoline-2-carboxylic acid, 3-cyclopentyl ether of estriol, quinazolone-2-carboxylic acid, Oestriol-3-cyclopentylaether, Quinestradiol, 3,4-dihydro-4-oxoquinazoline-2-carboxylic acid, 4-Chinazolon-2-carbonsaeure, 4-Quinazolone-2-carboxylic Acid, 4-Oxo-3,4-dihydro-chinazolin-2-carbonsaeure, Chinazol-4-on-2-carbonsaeure