cyclen

Cyclen (1,4,7,10-tetraazacyclododecane) 是一种氮杂冠醚的类似物，是制备有效的大环螯合物的中间体，是制备磁共振造影剂的前体物质。

Tricyclene, a monoterpene identified in various conifers such as Abies, Pinus, Picea, and Tsuga, exhibits notable presence across these species.

Bromocyclen, 一种在丹麦渔场的彩虹鳟鱼肌肉组织及德国北部施特尔河三种鱼类（鱥、鲫鱼和梭子鱼）中发现的杀虫剂，其检测到的浓度范围较高，介于0.09至1.23毫克/千克脂肪。