The ommochrome pigment present in the eyes of Loligo Vulgaris was extracted with a butanol‐acetic acid‐hydrochloric acid solution. The extraction mixture was examined before and after irradiation by visible light. A phenoxazinone ring opening together with a photo‐induced solvent addition, causing a yellow‐red batho‐chromic shift, were observed and a plausible explanation of the process has been carried out and is reported on the basis of the isolated products.
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Bolognese et al. (1988) studied this question.
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