1,3-Diazaspiro[4.5]decane-2,4-dione 5,5'-Cyclohexanespirohydantoin 5,5-Pentamethylenehydantoin 5,5-Pentamethylenespirohydantoin 702-62-5 Ba 2840 Cyclohexane-(spiro-5)-hydantoin Hydantoin, 5,5-pentamethylene- Hydantoin, pentamethylene- NSC172110 Spiro[cyclohexane-1,5'-hydantoin]