label: [(3R)-hydroxybutanoate](n) + H2O <=> [(3R)-hydroxybutanoate](n-5) + (3R)-hydroxybutanoate pentamer + H(+)
label_lc: [(3r)-hydroxybutanoate](n) + h2o <=> [(3r)-hydroxybutanoate](n-5) + (3r)-hydroxybutanoate pentamer + h(+)