[Capaurimine and related compounds. 3. Synthesis of dl-5,6,13,13a-tetrahydro-1,2,3,10,11-pentamethoxy-8H-dibenzo[a,g]quinolizine and dl-5,6,13,13a-tetrahydro-2,3,10,11,12-pentamethoxy-8H-dibenzo[a,g]quinolizine (studies on the syntheses of heterocyclic compounds. 286)].