一个很大的excel文档，包含了人体内所有可测到的小分子代谢物两两之间的距离，下载自HMDB内部库。可辅助用于代谢物功能分析和代谢网络的绘制。-A lot of excel documents, including the distance can be measured in the human body all small molecule metabolites between pairwise, downloaded HMDB internal library. Secondary m