Some last minute changes to the chemical reaction database. We really do need to store the CML file. On the other hand, we can skip to chemical formula as it is already included in the InChi. No need to duplicate information. Can we handle patents? Patent information is notoriously difficult to find. There are plenty of websites that offer basic patent information (what is the business model?) but only a few offer the full document. The is no patent DOI equivalent. So we are forced to store the full url to a resource as well. The example below describes a single carbon atom extraction. Firefox required!