000 00294nam a2200121 4500
005 20250921090856.0
082 _a547.059
_bKAT
100 _aKatritzky,Alan R.
_9759
245 _aThe Principles of Hetrocyclic Chemistry
260 _aNew York
_bAcadamic Press
_c1968
300 _a183
942 _cREF
999 _c3520
_d3520