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The present study explores the natural photochemical transformation mechanisms and fate of these drugs, examining direct and indirect photochemical transformation under simulated sunlight irradiation. The 2 antiviral drugs are photostable under certain conditions but significantly degrade in the presence of chromophoric dissolved organic matter (DOM). The degradation rate associated with the drugs' indirect photochemical transformation scaled with chromophoric DOM concentration. Quenchers and sensitizers were used to identify indirect photochemical transformation mechanism. Results suggested that both pharmaceuticals could be transformed by reacting with 1O2, \u2022OH, and excited chromophoric DOM. The 1O2 played an important role in indirect photochemical transformation. Furthermore, the reaction kinetics between their substructural molecules, guanine, isocytosine, and imidazole, with different reactive oxygen species were evaluated to determine which substrate functionalities were most susceptible to singlet oxygenation. Imidazole was identified as the reaction site for 1O2, and preliminary 1O2 oxidation mechanisms were further evaluated based on liquid chromatographic\u2013tandem mass spectrometric results. Finally, aquatic ecotoxicity assessment of phototransformed solutions revealed that the degradation of acyclovir and penciclovir may not ultimately diminish environmental risk because of either formation of more toxic intermediates than parent pharmaceuticals or some synergistic effects existing between the intermediates. Environ Toxicol Chem 2016;35:584\u2013592. \u00a9 2015 SETAC<\/jats:p>\n               <\/jats:sec>","DOI":"10.1002\/etc.3238","type":"journal-article","created":{"date-parts":[[2015,9,10]],"date-time":"2015-09-10T12:14:35Z","timestamp":1441887275000},"page":"584-592","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":27,"title":["Indirect photochemical transformations of acyclovir and penciclovir in aquatic environments increase ecological risk"],"prefix":"10.1093","volume":"35","author":[{"given":"Jibin","family":"An","sequence":"first","affiliation":[{"name":"University of Chinese Academy of Sciences Beijing People's Republic of China"},{"name":"State Key Laboratory of Organic Geochemistry and Guangdong Key Laboratory of Environmental Resources Utilization and ProtectionGuangzhou Institute of GeochemistryChinese Academy of Sciences Guangzhou People's Republic of 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