Figure 4.

¹H-detected 2D ¹H/¹³C HETCOR spectrum of danazol/vanillin co-crystals obtained using the pulse sequence shown in Figure 1c with N=1(black) and N=3(red). The initial ¹H→¹³C CP contact time was 2.0 ms, and each ¹³C→¹H CP contact time was 0.4 ms. Other experimental parameters include 6 ms of each signal acquisition, 7 s recycle delay, and 36 scans for each t₁ increment.