Parse this person name:

Aleksandr Fechner (1796-1873, flourished 1825-1848)
user
first_name: Aleksandr
last_name: Fechner
middle_names: []
temporal:
- start: 1796
  end: 1873
  type: life_span
- start: 1825
  end: 1848
  type: flourished
titles: []
extra_info: []
assistant