The naphthyl analogue of retinal (2) combines with bacterio-opsin to produce an artificial pigment absorbing at λmax 504 nm; this suggests that in the native pigment all-trans-retinal may be held around the 6,7-bond in a planar ring–chain conformation.
M. Akhtar, L. Jallo and A. H. Johnson, J. Chem. Soc., Chem. Commun., 1982, 44 DOI: 10.1039/C39820000044
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