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Structure of Chlorophyll.
The structure of chlorophyll b is shown with International Union of Pure and Applied Chemistry numbering. In chlorophyll a, the C7 formyl is a methyl group. Chlorophyll a′ is the C132 epimer of chlorophyll a. The y axis of the molecule passes through the N atoms of rings A and C and the x axis through the N atoms of ring B and D. Without the central magnesium ion, the tetrapyrrole is referred to as a pheophytin.
