Butyl sulfide
At a glance
According to The Good Scents Company, this material has an odor type of sulfurous, with descriptor tags: sulfurous, garlic, onion, egg nog, coffee, sulfurous, fatty, beefy roasted beefy, onion cooked onion, egg nog, coffee, garlic. (CAS 109-79-5)
Why synthetics aren't a downgrade, a different toolkit โ ยท Why some materials get IFRA-restricted โ