New search engine for OA literature in chemistry

ChemRefer is a new search engine for OA literature in chemistry. From the site:

ChemRefer is a search engine that is designed to allow students, academics, chemical and pharmaceutical companies quick access to chemistry literature which is available on the internet. There is plenty of such literature around, but it is all located on different websites. Most such websites contain a mixture of accessible and restricted literature and it is frustrating to locate an article, only to find it restricted to subscribers. ChemRefer only finds literature that is full text and freely available (from many different sources).