An Au–Ag hybrid nanoparticle array with dense hotspots was constructed through a low-cost route for SERS detection with high sensitivity and stability.

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The absolute configuration of rakicidin C was predicted by comparison of optical rotation data and absolute configuration of APD-cyclic depsipeptides and further determined by total synthesis. The absolute configuration of five chiral centers was determined as 2R, 15R, 16R, 17S, and 19S. Our efficient route involves 19 longest linear steps with an overall yield of 1.49%.