19-Iodo-(sup 131)Icholest-5-en-3beta-ol 42220-21-3 Cholest-5-en-3-ol, 19(iodo-(sup 131)I)-, (3beta)- Iodocholesterol (I 131) Iodocholesterol I 131 [USAN] Iodocholesterolum (131 I) [INN-Latin] Iodocolesterol (131 I) [INN-Spanish]