preferred_name: a 4-deoxy-alpha-L-threo-hex-4-enopyranuronoside + L-rhamnopyranose => an alpha-L-rhamnosyl-(1->4)-beta-D-glucuronide
preferred_name_lc: a 4-deoxy-alpha-l-threo-hex-4-enopyranuronoside + l-rhamnopyranose => an alpha-l-rhamnosyl-(1->4)-beta-d-glucuronide
label: a 4-deoxy-alpha-L-threo-hex-4-enopyranuronoside + L-rhamnopyranose => an alpha-L-rhamnosyl-(1->4)-beta-D-glucuronide
label_lc: a 4-deoxy-alpha-l-threo-hex-4-enopyranuronoside + l-rhamnopyranose => an alpha-l-rhamnosyl-(1->4)-beta-d-glucuronide