Parse this person name:

Sinaida Mälzer (1729-1791, flourished 1750-1774)
user
first_name: Sinaida
last_name: Mälzer
middle_names: []
temporal:
- start: 1729
  end: 1791
  type: life_span
- start: 1750
  end: 1774
  type: flourished
titles: []
extra_info: []
assistant