preferred_name: (9Z,11E)-octadecadienoate => (9Z,12Z)-octadecadienoate
preferred_name_lc: (9z,11e)-octadecadienoate => (9z,12z)-octadecadienoate
label: (9Z,11E)-octadecadienoate => (9Z,12Z)-octadecadienoate
label_lc: (9z,11e)-octadecadienoate => (9z,12z)-octadecadienoate