The thermal stability of the coloured open form of 5-methoxy-(7) and 5′-piperidinomethyl-1,3,3-rimethylspiro(indoline-2,3′-[3H]naphtho[2,1-b][1,4]oxazine)(6) is strongly dependent on pH.
T. Yamaguchi, T. Tamaki, Y. Kawanishi, T. Seki and M. Sakuragi, J. Chem. Soc., Chem. Commun., 1990, 867 DOI: 10.1039/C39900000867
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