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Inset: Electronic absorption spectrum of porphyrin isolated after the cyclopropanation reaction as the Zn-complexed form indicates modification; spectrum of Zn-PPIX standard is provided for comparison. High-resolution mass spectrometry (HRMS) analysis of modified porphyrin isolated after the cyclopropanation reaction, showing major peaks with m/z of 735.3378 and 821.3753, which correspond to multiple additions of C4H6O2 fragment.
