双分子李药 NO2 C2H5OOC COOCH3 H3CNCH3 H Nitrendipine NO2 H H3CNCH3 C2H5OOC COO(CH2)400C COOC2H5 H3CNCH3 NO, BDHP 双分子孪药 BDHP Nitrendipine NO2 H N COO(CH2)4OOC H3C COOC2H5 CH3 H3C C2H5OOC N CH3 H NO2 NO2 N H COOCH3 CH3 C2H5OOC H3C