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Synthesis, Spectroscopy and X-Ray Crystal Structure of 9-Methyl-3-Thiophen-2-Yl-Thieno [3, 2-e] [1, 2, 4] Triazolo [4, 3-c] Pyrimidine-8-Carboxylic Acid Ethyl Ester

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American Journal of Analytical Chemistry 2011年第3期2卷 371-375页

作者： Nikhath Fathima Mohamed Ziaulla Afshan Banu Shridhar Ishwar Panchamukhi Imtiyaz Ahmed Khazi noor shahina begum 不详

The Preparation of 9-Methyl-3-thiophen-2-yl-thieno [3, 2-e] [1, 2, 4] triazolo [4, 3-c] pyrimi-dine-8-carboxylic acid ethyl ester is described. Elemental analysis, IR spectrum, 1H NMR, 13C NMR and X-ray crystal structure analyses were carried out to determine the composition and molecular structure of the title compound. There are two independent molecules in the asymmetric unit exhibiting intermolecular C-H…N, C-H…O interactions with additional π-π interaction that further helps in stabilizing the supramolecular structure. The results showed that the proposed method for synthesis is simple, precise and accurate which was further confirmed by crystal structure analysis.

关键词： Thieno-Triazolo-Pyrimidine Derivative Characterization X-Ray Crystallographic Analysis C-H…N C-H…O and π-π Weak Interactions

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Central Retinal Vein Occlusion in Healthy Young Adults Following COVID-19 Vaccination: Case Series

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Open Journal of Ophthalmology 2023年第4期13卷 360-370页

作者： Shah-noor Hassan Shahnaz begum Nawreen Binte Anwar Nirupam Chowdhury Basil Anwar Department of Ophthalmology Bangabandhu Sheikh Mujib Medical University Dhaka Bangladesh Department of Ophthalmology BIRDEM General Hospital & Ibrahim Medical College Dhaka Bangladesh Department of Ophthalmology Dr. Sirajul Islam Medical College & Hospital Ltd. Dhaka Bangladesh

Our aim is to report 4 cases of central retinal vein occlusion following COVID-19 vaccine administration. In this case series, 4 patients between 23-32 years of age presented to us with unilateral central retinal vein occlusion after 2-15 days of getting vaccinated against COVID-19. One patient was a known case of hypertension and 1 was hypothyroid. All the patients had disc swelling, flame shaped haemorrhages, dilated and tortuous blood vessels in the retina. One patient had cystoid macular edema and was treated with intravitreal ranibizumab. As there were no positive systemic risk factors or incidents, COVID-19 vaccines might have an association with the central retinal vein occlusion in these cases. .

关键词： COVID-19 Vaccine Central Retinal Vein Occlusion SARS-CoV-2

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