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319:بنية معقّد بورفيرين مع الفاناديوم (على اليسار) التي استخلصها ألفرد ترايبس من عيّنة نفطية، ثمّ لاحظ بعد ذلك وجه الشبه البنيوي بينها وبين بنية الكلوروفيل a (على اليمين).
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Structure of a vanadium porphyrin compound (left) extracted from petroleum by Alfred E. Treibs, and chlorophyll a (right)
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