(E)-but-1-en-1-SO-peroxol <=> (Z)-butanethial oxide
(e)-but-1-en-1-so-peroxol <=> (z)-butanethial oxide
(E)-but-1-en-1-SO-peroxol <=> (Z)-butanethial oxide
(e)-but-1-en-1-so-peroxol <=> (z)-butanethial oxide