Deacetylates 17-O-acetylajmaline and 17-O-acetylnorajmaline, but is inactive toward other acetylated alkaloids. 17-O-acetylajmaline + H2O = acetate + ajmaline + H(+) 17-O-acetylnorajmaline + H2O = acetate + H(+) + norajmaline Belongs to the 'GDSL' lipolytic enzyme family.