CREATE TABLE table_12715053_1 (compound_name VARCHAR(255), chemical_class VARCHAR(255), clinical_trials_β VARCHAR(255))
How many compound names list a chemical class of depsipeptide and a clinical trials β value of 1/7?
    
SQL: SELECT COUNT(compound_name) FROM table_12715053_1 WHERE chemical_class = "Depsipeptide" AND clinical_trials_β = "1/7"