Parse this person name:

Guenther Gröttner (1285-1362, flourished 1307-1319)
user
first_name: Guenther
last_name: Gröttner
middle_names: []
temporal:
- start: 1285
  end: 1362
  type: life_span
- start: 1307
  end: 1319
  type: flourished
titles: []
extra_info: []
assistant