label: 2-O-(4-deoxy-beta-L-threo-hex-4-enopyranuronosyl)-alpha-L-rhamnose + H2O => 5-dehydro-4-deoxy-D-glucuronate + L-rhamnopyranose
label_lc: 2-o-(4-deoxy-beta-l-threo-hex-4-enopyranuronosyl)-alpha-l-rhamnose + h2o => 5-dehydro-4-deoxy-d-glucuronate + l-rhamnopyranose