2-oxopent-4-enoate => (2E)-2-hydroxypenta-2,4-dienoate
2-oxopent-4-enoate => (2e)-2-hydroxypenta-2,4-dienoate
2-oxopent-4-enoate => (2E)-2-hydroxypenta-2,4-dienoate
2-oxopent-4-enoate => (2e)-2-hydroxypenta-2,4-dienoate