I’d seen that first link already but the second link got it, thank you! For those that don’t want to click:

beta-Mercaptoethanol: rather similar to ethanethiol, but the extra OH group gives it some real staying power. Sort of the “sun and sport” version of the parent compound.

and

Ethanethiol: the prototype of the class. All the basic sulfur-stink notes - skunky and intestinal. Very volatile, too, which really gives it a quick wallop, but at least it doesn’t stay around forever.