“次甲基”的英语？

然后通过大量实验筛选出两种有效添加剂环丁砜和六次甲基四胺.Following that, two effective additives - syclotersuphone and methenamine are found by series experiments.盐酸雷尼替丁与7, 7, 8, 8-四氰基对二次甲基苯醌荷移反应的研究.Study on the Charge - Transfer Reaction of Raniti...