1-(4-(Bis(4-methoxyphenyl)phenylmethoxy)-1-oxobutoxy)-2,5-pyrrolidinedione 123658-22-0 2,5-Pyrrolidinedione, 1-(4-(bis(4-methoxyphenyl)phenylmethoxy)-1-oxobutoxy)- N-Succinimidyl-4-O-(4,4'-dimethoxytrityl)butyrate SDTB