Tetraaza-12-crown-4 tetrahydrochloride1,4,7,10-四氮杂环十二烷 四盐酸盐Cyclen tetrahydrochloride轮环藤宁 四盐酸盐1,4,7,10-Tetraazacyclododecane tetrahydrochlorideCyclen tetrahydrochloride1,4,7,10-Tetraazacyclododecane tetrahydrochloride轮环藤宁四盐酸盐1,4,7,10-四氮环十二烷 四盐酸盐1,4,7,10-四氮环十二烷四盐酸盐