Parse this person name:

Etzler, Thaddäus Gretel M. D.., Gräfenhainichen (died 1902)
user
first_name: Thaddäus
last_name: Etzler
middle_names:
- Gretel
- M.
- D.
temporal:
- start: null
  end: 1902
  type: life_span
titles: []
extra_info:
- Gräfenhainichen
assistant