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      <subfield code="a">Elderfield, Robert Cooley,</subfield>
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      <subfield code="a">Heterocyclic compounds.</subfield>
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      <subfield code="a">v. 1. Three-, four-, and six-membered compounds containing one O, N, and S atom.--v. 2. Polycyclic five- and six-membered compounds containing one O or S atom.--v. 3. Polycyclic derivatives of pyrrole; polycyclic systems with one nitrogen common to both rings; pyrindine and related compounds.--v. 4. Quinoline, isoquinoline, and their benzo derivatives.--v. 5. Five-membered heterocycles containing two hetero atoms and their benzo derivatives.--v. 6. Six-membered heterocycles containing two hetero atoms and their benzo derivatives.--v. 7. Polycyclic compounds containing two hetero atoms in different rings. Five- and six-membered heterocycles containing three hetero atoms and their benzo derivatives.--v. 8. Tetrazoles, tetrazines, and purines and related ring systems.--v. 9. Pteridines, alloxazines and compounds with 7-membered or larger rings.</subfield>
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