A cyclic undecapeptide of the following formula: ** Formula ** in which W is MeBmt; X is -Abu; R is (D) -MeAla; Y is N-ethylVal (EtVal); Z is Val; Q is MeLeu; T1 is (D) Ala; T2 is MeLeu; and T3 is MeLeu, for use in the treatment of bone ring muscular dystrophy.
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