C07D 311/34

Benzo[b]pyrans, not hydrogenated in the carbocyclic ring with oxygen or sulfur atoms directly attached in position 4 with aromatic rings attached in position 2 or 3 with aromatic rings attached in position 3 only

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data.epo.org/linked-data/def/cpc/C07D311-34

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C07D 311/26

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