Esterase that can hydrolyze acetylthiocholine and propionylthiocholine in vitro (PubMed:15980188). Substrate preference is propionylthiocholine > acetylthiocholine (PubMed:15980188). Possesses extremely low activity against butyrylthiocholine (PubMed:15980188). Belongs to the 'GDSL' lipolytic enzyme family.