How many compound names list a chemical class of depsipeptide and a clinical trials β value of 1/7?
CREATE TABLE "clinical_pipeline_of_marine_pharmacology" (
  "clinical_status" text,
  "compound_name" text,
  "trademark" text,
  "marine_organism" text,
  "chemical_class" text,
  "molecular_target" text,
  "clinical_trials" text,
  "disease_area" text
);
SELECT COUNT("compound_name") FROM "clinical_pipeline_of_marine_pharmacology" WHERE "chemical_class"='Depsipeptide' AND "clinical_trials"='1/7';