I. PURIFICATION AND CHARACTERIZATION OF BRIAREIN A, A CHLORINE CONTAINING DITERPENOID FROM THE GORGONIAN BRIAREUM ASBESTINUM (PALLAS). II. ISOLATION AND CHARACTERIZATION OF TWO NEW CEMBRANOLIDES FROM THE GORGONIAN EUNICEA SUCCINEA (PALLAS): PEUNICIN AND EPIPEUNICIN. III. LOCATION OF METHYL GROUP IN METHYLGORGOSTANOL.