Download full text in PDF Opens in a new window. Article suggestions will be shown in a dialog on return to ScienceDirect. ... Please enable JavaScript to use all the features on this page. ... A potent tumor promoter, dihydroteleocidin B-4 (=dihydroteleocidin B) ( ) was synthesized from L-valine derivative using an acid-catalyzed cyclization of to a to construct the teleocidin B structure unit. ... A potent tumor promoter, dihydroteleocidin B-4 (=dihydroteleocidin B) was totally ...