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[en] The frustration parameter t'/t has been estimated for the spin-liquid system κ-ET2Cu2(CN)3 at ambient pressure using the previously reported Shubnikov-de Haas data. Using data for κ-ET2Cu(NCS)2 as a function of pressure and for κ-ET2Cu2(CN)3 in its pressure-induced metallic phase, the ratio has been estimated in several different ways, with fully consistent results. A final value of 0.95(3) is obtained, indicating the very strong degree of frustration in this system and fully compatible with its observed spin-liquid properties.