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Source: Chlorophyll d

Chlorophyll d (Chl d) is a form of chlorophyll, identified by Harold Strain and Winston Manning in 1943. It was unambiguously identified in Acaryochloris marina in the 1990s. It is present in cyanobacteria which use energy captured from sunlight for photosynthesis. Chl d absorbs far-red light, at 710 nm wavelength, just outside the optical range. An organism that contains Chl d is adapted to an environment such as moderately deep water, where it can use far red light for photosynthesis, although there is not a lot of visible light.
Chl d is produced from chlorophyllide d by chlorophyll synthase. Chlorophyllide d is made from chlorophyllide a, but the oxygen-using enzyme that performs this conversion remains unknown as of 2022.