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Solvolysis of 1,2‐dihydro‐3‐hydroxy‐3‐(p‐toluenesolfonyloxymethyl) 3H‐pyrido[3,2,1‐kl]‐phenothiazine gave 1,2,3,4‐tetrahydroazepino[3,2,1‐kl]phenothiazin‐3‐one.
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Kim et al. (1978) studied this question.
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