cis-Abienol synthase (EC 4.2.3.140, Z-abienol synthase, CAS, ABS) is an enzyme with systematic name (13E)-8α-hydroxylabd-13-en-15-yl-diphosphate-lyase (cis-abienol forming).
[1][2] This enzyme catalyses the following chemical reaction This enzyme is isolated from the plants Abies balsamea (balsam fir) and Nicotiana tabacum (tobacco).