Erek Erek 21 dan Kode Alam 21 di Buku Mimpi 2D Bergambar

2d 2121 Draw is an on learning munity where students of all skill levels can learn how to be a better artist. Our contributing artists and instructors are the best in the world.In this work, we introduce helical chirality into 2D COFs using confurationally stable enantiopure and racemic [5]helicenes as linkers in