<正>Six ethylene-propylene copolymer samples with different structural parameters were analyzed by ~1H NMR,~(13)C NMR and ~1H-~(13)C COSY in this paper.With the
<正>A series of quinolone derivatives containing benzimidazole,benzoxazole or benzothiazole ring were synthesized.The cytotoxicity of 12 new compounds was evalu