4,4-Dimethyl-2′-(methylsulfanyl)-1′,5′,7′,8′-tetrahydro-2H,4′H,6H-spiro[cyclohexane-1,6′-pyrido[2,3-d]pyrimidine]-2,4′,6-trione

4,4-Dimethyl-2′-(methylsulfanyl)-1′,5′,7′,8′-tetrahydro-2H,4′H,6H-spiro[cyclohexane-1,6′-pyrido[2,3-d]pyrimidine]-2,4′,6-trione

Spiro[cyclohexane-1,6′(5′H)-pyrido[2,3-d]pyrimidine]-2,6-dione, 7′,8′-dihydro-4′-hydroxy-4,4-dimethyl-2′-(methylthio)-