containing two hetero rings

Full Title

Heterocyclic compounds containing two or more hetero rings, at least one ring having selenium, tellurium, or halogen atoms as ring hetero atoms > containing two hetero rings

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• C07D 421/04 directly linked by a ring-member-to-ring-member bond
• C07D 421/06 linked by a carbon chain containing only aliphatic carbon atoms
• C07D 421/08 linked by a carbon chain containing alicyclic rings
• C07D 421/10 linked by a carbon chain containing aromatic rings
• C07D 421/12 linked by a chain containing hetero atoms as chain links