Parse this person name:

Ortwin Hettner (1801-1869, flourished 1817-1828)
user
first_name: Ortwin
last_name: Hettner
middle_names: []
temporal:
- start: 1801
  end: 1869
  type: life_span
- start: 1817
  end: 1828
  type: flourished
titles: []
extra_info: []
assistant