The myotonolytic use of compounds of formula I IMAGE I wherein R is hydrogen, acetyl or a group of formula II R'-O-CO-II wherein R' is alkyl(C1-8); phenyl; phenyl substituted in the 4-position with halogen, alkoxy(C1-4) or alkyl(C1-4); phenylalkyl; or phenylalkyl in which the phenyl group is substituted in the 4-position with halogen, alkoxy(C1-4) or alkyl(C1-4).
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