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1,3-(4,4′-bipyridinium disulfonic acid) propane-dihydrogen sulfate as highly effectual bi-functional catalysts for the rapid preparing chromeno[4,3-b]chromenes and pyrido[2,3-d:6,5-d′]dipyrimidines

Crossref DOI link: https://doi.org/10.1007/s11164-023-05206-0

Published Online: 2024-01-05

Published Print: 2024-02

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

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