1 By convention a normal lens on a 35mm film camera (and thus a full-frame EOS digital SLR) has a focal length of 50mm or so. 2  A lens with a focal length of 35mm is considered ânormalâ for a cropped-frame EF-S camera.
Aspirin. One of the best known aromatic acetates is acetylsalicylic acid, or aspirin, which is prepared by the esterification of the phenolic hydroxyl group of salicylic acid. Aspirin possesses a number of properties that make it the most often recommended drug.
Aspirin is perhaps the best-known member of the family of nonsteroidal anti-inflammatory drugs (NSAIDs). These drugs works by inhibiting the cyclooxygenase (COX) enzymes, which are responsible for the production of hormone-like biochemicals called prostaglandins and thromboxanes.