Synonyms: Acetic acid, 2-[[(4,6-dihydro-4-oxospiro[benzo[h]quinazoline-5(3H),1'-cyclopentan]-2-yl)methyl]thio]-, ethyl ester;acetic acid, 2-[[(4-hydroxyspiro[benzo[h]quinazoline-5(6H),1'-cyclopentan]-2-yl)methyl]thio]-, ethyl ester;Ethyl {[(4-oxo-4,6-dihydro-3H-spiro[benzo[h]quinazoline-5,1'-cyclopentan]-2-yl)methyl]sulfanyl}acetate