exhibit 2. 1 amendment agreement execution version – 31 january 2019 project vision – spa amendment agreement execution version – 31 january 2019 spa amendment agreement by and between 1. mrs. gertraud hymer, born on 3 february 1951 in weiler im allgau, germany, residing in bad waldsee, germany, 1. mrs. gertraud hymer, born on 3 february 1951 in weiler im allgau, germany, residing in bad waldsee, germany, mrs. gertraud hymer, born on 3 february 1951 in weiler im allgau, germany, residing in bad waldsee, germany, - herein “ seller 1 ” - 2. mrs. carolin hachenberg, born on 16 june 1984 in wangen im allgau, germany, residing in munich, germany, 2. mrs. carolin hachenberg, born on 16 june 1984 in wangen im allgau, germany, residing in munich, germany, mrs. carolin hachenberg, born on 16 june 1984 in wangen im allgau, germany, residing in munich, germany, - herein “ seller 2 ” - 3. mr. christian hymer, born on 20 november 1985 in wangen im allgau, germany, residing in munich, germany, 3. mr. christian hymer, born on 20 november 1985 in wangen im allgau, germany, residing in munich, germany, mr. christian hymer, born on 20 november 1985 in wangen im allgau, germany, residing in munich, germany, - herein “ seller 3 ” - - seller 1, seller 2 and seller 3 herein also referred to individually as a “ seller ” and collectively as “ sellers ” - 4. tyr holdings llc & co. kg, a limited partnership ( kommanditgesellschaft ) under the laws of germany, having its office in holzstraße 19, 88339 bad waldsee, germany, and registered with the commercial register ( handelsregister ) of the local court ( amtsgericht ) of ulm under hra 726307, 4. tyr holdings llc & co. kg, a limited partnership ( kommanditgesellschaft ) under the laws of germany, having its office in holzstraße 19, 88339 bad waldsee, germany, and registered with the commercial register ( handelsregister