preferred_name: (2E)-2-hydroxypenta-2,4-dienoate = 2-oxopent-4-enoate
preferred_name_lc: (2e)-2-hydroxypenta-2,4-dienoate = 2-oxopent-4-enoate
label: (2E)-2-hydroxypenta-2,4-dienoate = 2-oxopent-4-enoate
label_lc: (2e)-2-hydroxypenta-2,4-dienoate = 2-oxopent-4-enoate