The Ring Nitrogen Is Shared By A Six-membered Ring Patents (Class 540/205)
- 1-thia-5-aza-bicyclo(4.2.0)octane (including unsaturated; e.g., cepham, etc.) (Class 540/215)
- The 1-thia-5-aza-bicyclo(4.2.0)oct-ane is part of a polycyclo ring system having at least three cyclos (Class 540/216)
- Double bond between the 2,3-positions of the bicyclo ring system (e.g., 2 cephem, etc.) (Class 540/217)
- Ring expansion to produce the bicyclo ring system (Class 540/218)
- 7-amino cephalosporanic acid per se or salt thereof (i.e., 7-ACA or salt thereof) (Class 540/219)
- Purification or recovery (Class 540/220)
- 7,7-disubstituted (Class 540/221)
- Additional hetero ring containing (Class 540/222)
- 2- or 4-position substituent contains hetero ring (Class 540/223)
- 3-position substituent contains a pyridine ring (e.g., quinoline, thienopyridine, lutidines, etc.) (Class 540/224)
- 3-position substituent contains sulfur (Class 540/226)
- Alkyl, hydroxyalkyl, alkoxyalkyl or alkanoyloxyalkyl bonded directly to 3 position (Class 540/228)
- Sulfur containing substituent (Class 540/229)
- Alkyl, hydroxyalkyl, alkoxyalkyl or alkanoyloxyalkyl bonded directly to 3 position (Class 540/230)