Tracing experiemnt

I am quite new to the website, and I am having problem loading the data, specifically ‘metabolites name’.
The normal name, such as Alanine, glucose, glutamine etc the website catches no problem, but what about labelled metabolites? such as glucose tracing where I have Lactate m+3 (I hope the website support labelling/tracing experiments :frowning: ). It is important for me to get KEGG pathway enrichment that way.
Unless the website doesn’t support labeling, any way around it?
Thank you