• WordNet 3.6
    • n isomerisation the conversion of a compound into an isomer of itself
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In science:

S-cis form. As the proton starts to dissociate from the N, the M-state gets progressively unstable as the planarity of the 5 member ring is lost. This results in the back-isomerisation of the 13cis, 14S-cis form to the 13-cis, 14S-trans form. This conformation corresponds to the late M-state.
Proton-Pump Mechanism in Retinal Schiff Base: On the molecular structure of the M-state