源起于发霉甜苜蓿，脱胎于生化实验室，华法林先生起初作为一种强力灭鼠毒药大杀四方。然而，在进入医药领域的道路上，他却因毒药的身份标签和种种流言而饱受质疑和反对。科学家们揭示了华法林抗凝血的机制，并证明了华法林抗凝治疗对患者的益处。从此，华法林先生以及他的衍生物们成为了抗凝治疗和防治鼠害的前线战士。

笔者在大学入学之初就受教于华彤文老师，后来跟随华老师做研究、搞教学、写教材，直至担任《大学化学》主编时依然听取华老师的教诲。在此文中分享40余年来近距离观察、感受和学习华老师严谨治学、勇于担当的教学与研究的态度和方法，期待我国的化学教育教学事业薪火相传，持续发展。

The complexes 1-4 of cyclobutanocucurbit[5]uril (CyB₅Q[5]) with Na⁺/K⁺ have been synthesized and characterized by single-crystal X-ray diffraction. The results show that although the inorganic salts are used when the cations are the same and the anions are different, in complex 1, Na⁺ closes one port of CyB₅Q[5] through Na—O seven coordination bonds to form a molecular bowl; in complex 3, Na⁺ completely closes the two ports of CyB₅Q[5] to form a molecular capsule with six Na—O coordination bonds; in complexes 2 and 4, the two ports of CyB₅Q[5] are completely closed to form K—O coordinated molecular capsules, but the K⁺ of complex 2 is six-coordinated and that of complex 4 is eight-/nine-coordinated. and complex 4 are connected by three oxygen bridges to form a 1D molecular chain.