1-propylpyrrole-2,5-dione 1-propyl-3-pyrroline-2,5-quinone 21746-40-7 26714-88-5 1-Propyl-1H-pyrrole-2,5-dione ZINC01751808 NSC92549 ST5404560 EINECS 244-564-8 562807_ALDRICH N-Propylmaleimide N-n-Propylmaleimide n-Propyl maleimide