iotrolan [ Berlex brand of iotrolan,DL 3-117,DL 3117,DL-3-117,Isovist,Isovist 300,Osmovist,Schering brand of iotrolan,iotrol ] nonionic, isotonic contrast medium designed for intrathecal use; RN given refers to cpd without isomeric designation; DL-3-117 refers to stereoisomer; structure given in first source