A reference and quiz in one fun app! Check out the clue, then guess what the molecule is. (iPhone only)
MOTW has been a popular feature on this site since 2001. Many molecules are suggested by our website visitors. Every structure is reviewed by a scientist and displayed in 3-D and flat images with a brief description.
Each week’s molecule also links to a sample record from the CAS REGISTRY, which is searched using SciFinder. Each record displays the registry number, index name and synonyms, bibliographic information, and more.