added references, and finished citing intro paragrpah

references.bib

@@ -0,0 +1,57 @@
+@article{Fijakowski2022,
+  title = {Acetylsalicylic Acid–Primus Inter Pares in Pharmacology},
+  volume = {27},
+  ISSN = {1420-3049},
+  url = {http://dx.doi.org/10.3390/molecules27238412},
+  DOI = {10.3390/molecules27238412},
+  number = {23},
+  journal = {Molecules},
+  publisher = {MDPI AG},
+  author = {Fijałkowski,  Łukasz and Skubiszewska,  Magdalena and Grześk,  Grzegorz and Koech,  Frankline Kiptoo and Nowaczyk,  Alicja},
+  year = {2022},
+  month = Dec,
+  pages = {8412}
+}
+
+@article{Sneader2000,
+  title = {The discovery of aspirin: a reappraisal},
+  volume = {321},
+  ISSN = {1468-5833},
+  url = {http://dx.doi.org/10.1136/bmj.321.7276.1591},
+  DOI = {10.1136/bmj.321.7276.1591},
+  number = {7276},
+  journal = {BMJ},
+  publisher = {BMJ},
+  author = {Sneader,  W.},
+  year = {2000},
+  month = Dec,
+  pages = {1591–1594}
+}
+
+@article{Guo2022,
+  title = {Safety and efficacy of compound methyl salicylate liniment for topical pain: A multicenter real-world study in China},
+  volume = {13},
+  ISSN = {1663-9812},
+  url = {http://dx.doi.org/10.3389/fphar.2022.1015941},
+  DOI = {10.3389/fphar.2022.1015941},
+  journal = {Frontiers in Pharmacology},
+  publisher = {Frontiers Media SA},
+  author = {Guo,  Jie and Hu,  Xiaolei and Wang,  Jing and Yu,  Bin and Li,  Juan and Chen,  Jianting and Nie,  Xiaoli and Zheng,  Zhijian and Wang,  Shixuan and Qin,  Qun},
+  year = {2022},
+  month = Oct 
+}
+
+@article{Hartel2009,
+  title = {Preparation of Oil of Wintergreen from Commercial Aspirin Tablets. A Microscale Experiment Highlighting Acyl Substitutions},
+  volume = {86},
+  ISSN = {1938-1328},
+  url = {http://dx.doi.org/10.1021/ed086p475},
+  DOI = {10.1021/ed086p475},
+  number = {4},
+  journal = {Journal of Chemical Education},
+  publisher = {American Chemical Society (ACS)},
+  author = {Hartel,  Aaron M. and Hanna,  James M.},
+  year = {2009},
+  month = Apr,
+  pages = {475}
+}