“…HR MS: found m/z 538.3478 [M] + ; calculated for C 26 H 46 N 6 O 6 + 538.3473.N,N´-((1R,3S)-1,2,2-Trimethylcyclopentane-1,3-diyl)bis[2-(4-phenylpiperazin-1-yl)acetamide] (4k).The yield was 0.57 g (61%), brown oily substance; [α] D 23 = +3.3 (EtOH) 1. H NMR, δ: 0.87 (s, 3 H, C(6)H 3 ); 1.00 (s, 3 H, C(7)H 3 ); 1.43 (s, 3 H, C(8)H 3 ); 1.99-2.28 (m, 4 Н, Н(5 ax ), Н(5 eq ), Н(4 ax ), Н(4 eq )); 2.68-2.78 (m, 8 Н, Н(13), Н(16), Н(17), Н(19)); 3.02 (d, 2 Н, H(11), J = 4.0 Hz); 3.11 (d, 2 Н, Н(12), J = 10.6 Hz); 3.19-3.27 (m, 8 Н, H(14), Н(15), Н(18), Н(20)); 4.30-4.37 (m, 1 Н, Н(3)); 6.88-6.92 (m, 2 Н, Н(25), Н(30)); 6.93-6.96 (m, 4 Н, Н(23), Н(27), Н(28), Н(32)); 7.23 (d, 1 Н, NH, J = 9.9 Hz); 7.28-7.32 (m, 4 Н, H(24), Н(26), Н(29), Н(31)); 7.44 (br.s, 1 Н, NH) 13. C NMR, δ: 18.0 (C(6)), 21.3 (C(7)), 22.2 (C(8)), 27.4 (C(4)), 34.7 (C(5)), 47.0 (C(2)), 49.3 and 49.4 (С(14), С(15) and С(18), С(20)), 53.3 and 53.4 (С(13), С(16) and С(17), С(19)), 54.6 (С(3)), 61.4 (С(12)), 62.0 (С(11)), 62.4 (С(1)), 115.9 and 116.0 (С(23), С(27) and С(28), С(32)), 120.0 (С(25), С(30)), 129.0 (С(29), С(31), С(24), С(26)), 150.8 (С(21), С(22)), 168.9 and 169.4 (С(9), С(10)).…”