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The molfile serves as a de facto standard for chemical information exchange. It is perhaps the most widely supported format with its core syntax being easy to understand, parse, and generate. Beyond the core syntax, more advanced features such as sgroups and enhanced stereochemistry are rarely supported, often only being partially implemented and used. Additionally, several vendors, toolkits, and service providers have added extended syntax to their molfiles to solve particular corner cases or representation problems. This talk will provide a brief summary of the less widely supported features of the molfile including sgroups and enhanced stereochemistry. Additionally, a survey of how extensions can/have been implemented and which extensions exist "in the wild". Special attention will be paid to capturing of coordination bonds for extending the InChI to handle organometallics.