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Chemical structures and mechanisms for sensitive detection of Zn2+ in tissues. (a) GdDOTA–diBPEN, GdDO3A–BPEN, the parent MnPyC3A compound, and MnPyC3A–BPEN. (b) Mechanism of contrast enhancement involves binding of Zn2+ to the agent, followed by the agent-Zn2+ complex forming a ternary complex with albumin.
