Perhaps Iso-E? It's a chemical that doesn't have a huge profile itself, but imparts a certain woodiness and brilliance. Very evident in TdH, but likely Tuscan Leather has some, though TL is primarily a leather to my nose.
An Iso-E bomb is Lalique Encre Noire. It's quite different, it's a fresh vetiver, but if you feel something in common then it must be it.