Parse this person name:

Mehmet de Keijser (1818-1887, flourished 1842-1864)
user
first_name: Mehmet
last_name: de Keijser
middle_names: []
temporal:
- start: 1818
  end: 1887
  type: life_span
- start: 1842
  end: 1864
  type: flourished
titles: []
extra_info: []
assistant