C07D501/20 - CPC Classification

Heterocyclic compounds containing 5-thia-1-azabicyclo [4.2.0] octane ring systems, i.e. compounds containing a ring system of the formula:, e.g. cephalosporins; Such ring systems being further condensed, e.g. 2,3-condensed with an oxygen-, nitrogen- or sulfur-containing hetero ring; Compounds having a nitrogen atom directly attached in position 7 with a double bond between positions 2 and 3 7-Acylaminocephalosporanic or substituted 7-acylaminocephalosporanic acids in which the acyl radicals are derived from carboxylic acids

• C07D501/22 » with radicals containing only hydrogen and carbon atoms, attached in position 3 34
• C07D501/24 » with hydrocarbon radicals, substituted by hetero atoms or hetero rings, attached in position 3 15
• C07D501/57 » with a further substituent in position 7, e.g. cephamycines 9

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