PROTOPORPHYRIN IX CONTAINING MG HEG Cc1c2cc3[n+]4c(cc5c(c(c6n5[Mg@]47n2c(c1CCC(=O)O)cc8[n+]7c(c6)C(=C8CCC(=O)O)C)C)C=C)C(=C3C=C)C