Imizwayi igama elisho iqembu lamaChwe amabili noma ukweqa ahlanganiswe iziphoqi zokuhehana ezibizwa iminqalo yevanga; nokho alibhekiseli ezihonyweni ezibhekana nokufanayo. Kodwana kumchazandalo wohoyana, nomchazatho wemvelo, kanye nomchazatho wempilo, elithi imizwayi libhekisela nasezihonyweni ezimagcezichwe.

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Umfanekiso wesimoncinci sesiphoqi seChwe- oveze umzwayi we-PTCDA, lapho amasongo amahlanu omCalahle wesithupha ebonakala khona.
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Umfanekiso wesimoncinci esiguduza ngokugqaya semizwayi emasongo ayisihlanu, oqukethe imihumo esamigqa yamayonda ayisihlanu womcalahle.[1]
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Umfanekiso wesimoncinci sesiphoqi seChwe elibizwa '1,5,9-trioxo-13-azatriangulene' nohlaka lwalo lwevanga.[2]

Umzwayi kungaba owenuzilinye (homonuclear), okusho ukuthi uqukethe amaChwe enhlwa eyodwa, ngokwesibonelo, amaChwe amabili womzwayi wesOhwe (O2); noma angaba awenuzilimbe (heteronuclear), okungumXube wevanga owakhiwa yizinhlwa ezeqa eyodwa, ngokwesibonelo, amanzi (anamachwe amabili weHwanzi nechwe lesOhwe elinye; H2O). Ngokomchachiso wempekumpeku yohowo, ibizo elithi umzwayi livame ukusetshenziswa ukuchaza noma yiziphi izinhlayiyana zohowo zazo zonke izakhiwo. Lencazelo ishaya indiva imfuneko umzwayi kufanele uqukathe amaChwe amabili, njengoba uhowo oluntentemukayo lunechwe elinye. AmaChwe nezixhoxho ezixhunywanga ngezinzuba, ezifana neminqalo yeHwanzi noma iminqalo yesihonyo , ngokuvamile akuthathwa njengomzwayi owodwa.

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