Benjamin Soup (also known as Benno) was arrested during a raid in Amsterdam. He was sent to Mauthausen where he died.
His parents (his father was a member of the Jewish Council) and other family members survived the war.
Ina Soep and Jacob Polak, Steal a pencil for me. Love letters from camp Bergen-Belsen and Westerbork (2000)
For a biographical note see: H.E. Dominicus, Mauthausen. Een gedenkboek (2e herziene en uitgebreide druk; Amsterdam 1999) 142-143.
This person is commemorated on a memorial in Amsterdam. More information on this memorial can be found (in Dutch) on the website of the Nationaal Comité 4 en 5 mei.