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Chempedia is the free and open chemical substance registry. It enables anyone to register, at no cost, individual substances through a Web-based interface. Each substance receives a unique, numerical, checksummed identifier that can be used anywhere and looked up at no cost. Each substance also gets a canonical URI from which everything that is known through Chempedia can be found.

Chempedia uses a streamlined from of peer review that combines concepts used in traditional peer review with experiences learned from modern social media.

Source: depth-first