00338nam a2200109   450000500170000002000180001708200110003510000270004624500920007326000560016530000070022120251114131725.0  a9789559244516  b007465  aPadumadasa, Chayanika   aChemistry of Five and Six - Membered Heterocylic Compounds and their Benzo Derivatives/  aRajagiriya: bInstitute of Chemistry Ceylon,c2018.  a44