2d 17In this work, we introduce helical chirality into 2D COFs using confurationally stable enantiopure and racemic [5]helicenes as linkers inNOMOR EREK EREK 17 DI BUKU MIMPI 2D TERLENGKAP. Permainan nomor 17 Erek Erek 17 dan Kode Alam dalam buku mimpi dilambangkan dengan bangau, sejenis