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Unexpected conversion of 4-oxo-4H-chromene-2-carboxylic acid to 2-(1,3-benzothiazol-2-yl)-4H-chromen-4-one and spiro[1,4-benzothiazine-2,2'-chromene]-3,4'(3'H,4H)-dione

Crossref DOI link: https://doi.org/10.1007/s10593-022-03058-x

Published Online: 2022-02-02

Published Print: 2022-01

Update policy: https://doi.org/10.1007/springer_crossmark_policy

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