Аннотация:This talk presents our recent results [1] on nonfactorizable charm-loop contributions to the amplitudes of rare exclusive B-decays induced by flavour-changing neutral currents (FCNC). We show that such contributions induced by a soft-gluon emission from the charm-quark loop may be expressed via three-particle quark-antiquark-gluon distribution amplitude (3DA) of the B-meson, ⟨0|q¯(x)Gμν(y)b(0)|B(p)⟩, and the knowledge of the full functional dependence of the latter quantity on the variable (x−y)2 is necessary for a proper summation of potentially large terms O((ΛQCDmb/m2c)n) in the amplitudes of FCNC B-decays.