Active ingredients of National Drug Codes

[veleritas]

I have been working on identifying the active ingredients of drugs coded with National Drug Codes, and was wondering if we wanted to include this information in MyChem?

The project is here. I use the semantic network included in RxNorm to convert from NDCs to active ingredients. Currently I am identifying active ingredients with RxNorm RXCUIs, but since we can't redistribute this information, we will likely need to use another identifier space for the active ingredients.