抗肿瘤活性6 - (cyclohexylamino) 1, 3-dimethyl-5 (2-pyridyl) furo [2, 3 - d] pyrimidine-2 4 (1 h、3 h)土卫四及其Ti (IV)、锌(II)、铁(III)和Pd (II)配合物在K562和Jurkat细胞系