Here, a DNA cleavage reagent (1-(anthracen-9-ylmethyl)-1,5,9-triazacyclododecane = Ant-[12]aneN3) was designed and synthesized, and its DNA photocleavage activity under UV irradiation at λ = 365 nm was evaluated. Ant-[12]aneN3 is a molecule containing anthracene as the photosensitizer and [12]aneN3 ( = 1,5,9-triazacyclododecane) as the DNA-interacting component. The cyclic polyamine [12]aneN3 could coordinate with zinc ions (Zn