I typically use heptane but will try ome of these, they look to be super expensive especially at sigma, lab alley has a decent prices… I’ve heard good things about the THF
The yellow stuff is probably a higher molecular weight and not vaporizable in the GC 
AI was also supposed to free us from tedious tasks. but now it makes art while we do tedious tasks. and it seems the only think its freeing people from is a job.
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Please use this method instead, sulfur can make potentially deadly H2S gas as byproduct
https://pubs.acs.org/doi/10.1021/acs.jnatprod.7b00946?ref=recommended