00330nam a2200109 a 450000500170000000800410001704100080005810000190006624500800008526400440016530000110020920260717080005.0260701s1976    ii            000 0 eng d  aeng1 aAcheson, R. M.13aAn introduction to the chemistry of heterocyclik compounds /cAcheson, R.M. 1aNew York :bJohn wiley and sons,c1976.  a499 p.