tiamulin [ 2-(diethylaminoethyl)thioacetoxymutilin,81723 HFU,Dynamutilin,tiamulin fumarate,tiamulin fumarate (1:1), (3aS-(3aalpha,4beta,5alpha,6alpha,8beta,9alpha,9abeta,10S*))-isomer,tiamulin hydrochloride,tiamutin ] 81723 HFU and tiamutin are for fumarate salt; prevents senescence in ascomycete; pleuromutilin derivative; RN given refers to ((3aS-(3aalpha,4beta,5alpha,6alpha,8beta,9alpha,9abeta,10S*))-isomer