For my research project on liposomal formulation of cisplatin, i have used tried many lipids to make complex with cisplatin aqua forms. the lipids include anionic phospholipids. I've found some to form a stable complex with aquaforms and gives better entrapment into liposomes I'm going for other lipids too. but are there any other anionic lipophilic polymers that i can use for formulation that can be administered through intravenous route?