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1.
Comprehensive Heterocyclic Chemistry : Five-Membered Rings with Two or More Nitrogen Atoms by Katritzky, Alan R., Rees, C... ISBN: 9780685438510 List Price: $2,200.00
2.
Comprehensive Heterocyclic Chemistry : Comprehensive Heterocyclic Chemistry, Five-Membered R... by Katritzky, Alan R., Rees, C... ISBN: 9780080307053 List Price: $491.50