AZETIDINE 53860-05-2 156423-81-3 503-29-7 281069_ALDRICH AI3-61395 Azetidine, L- EINECS 207-963-8 trimethylenimine 92457_FLUKA azacyclobutane trimethylene imine Azetidine, homopolymer Polypropylene amine InChI=1/C3H7N/c1-2-4-3-1/h4H,1-3H CHEBI:30968