In this series:SteroidsOral steroidsTopical steroidsFingertip units for topical steroidsSteroid nasal sprays Steroids can be classified based on their chemical composition.[52] One example of how MeSH performs this classification is available at the Wikipedia MeSH catalog. Examples of this classification include: Even though "keto" is a standard prefix in organic chemistry, http://pilomaterial.info/user/fishcat2/