obsolete heptadecanoyl-[acp] elongase/decarboxylase activity (obsolete GO:0102331)
OBSOLETE. Catalysis of the reaction: malonyl-CoA + 3 H+ + a heptodecanoyl-[acp] = octadec-1-ene + 2 carbon dioxide + coenzyme A + a holo-[acyl-carrier protein].