Notes: Azide-polysarcosine50 is an azide-containing form of the amine-functionalized hydrophilic polymer polysarcosine50.{69660} Azide-polysarcosines have been used in the formation of hydrophobicity-masking antibody-drug conjugates for the selective release of monomethyl auristatin E (Item No. 16267) to tumors in rats.