Let A', B', C' be the reflections of A, B, C on the opposite sides; A+, B+, C+ the apices of the external Fermat triangles; A-, B-, C- the same of the internal Fermat triangles. Then A', B', C', A+, B+, C+, A-, B-, C-, the circumcenter O and the isodynamic points Is define a desmic structure not including A, B, C.