Cyclobutane-1,2,3,4-tetracarboxylic dianhydride was used to synthesize polyimide films and poly(amic acid) having liquid crystal alignment layers. Reactant for: . Preparation of biologically and pharmacologically active molecules . Preparation of photosensitive polyimide material for high performance organic thin-film transistors . Selective crosslinking of polyimide for photonic devices Cyclobutane-1,2,3,4-tetracarboxylic dianhydride was used to synthesize polyimide films and poly(amic acid) having liquid crystal alignment layers. Reactant for: . Preparation of biologically and pharmacologically active molecules . Preparation of photosensitive polyimide material for high performance organic thin-film transistors . Selective crosslinking of polyimide for photonic devices