Parse this person name:

Gastón Viana-Diéguez (1795-1866, flourished 1821-1849)
user
first_name: Gastón
last_name: Viana-Diéguez
middle_names: []
temporal:
- start: 1795
  end: 1866
  type: life_span
- start: 1821
  end: 1849
  type: flourished
titles: []
extra_info: []
assistant