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. 2023 Jan 25;13:1386. doi: 10.1038/s41598-023-27948-y

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Plausible mechanism for the synthesis of 2-amino-tetrahydro-spiro[[chromene-4,3′-indoline]-3-carbonitrile 6 and 2,2′-aryl/heteroaryl-methylene-bis(3-hydroxy-cyclohex-2-enone) 7.