*2.3. Structural Determination*

Colorless single crystals of compounds **6** and **7** were obtained by slowly evaporating a methanol solution containing pure compounds **6** and **7** at room temperature. Single crystal X-ray diffraction data of compounds **6** and **7** were obtained using a SuperNova, Dual, Cu at zero, AtlasS2 diffractometer (Agilent, CA, USA) equipped with MoKα radiation (λ = 1.54184 Å) at 100.00(10) K. The crystal dimensions of compounds **6** and **7** were 0.11 × 0.11 × 0.08 mm<sup>3</sup> and 0.14 × 0.13 × 0.12 mm<sup>3</sup> , respectively.

A total of 3608 reflections were collected by employing an ω scan mode for compound **6**, 6797 of which were independent with R*int* = 0.1240, R*sigma* = 0.1384. The final R<sup>1</sup> was 0.0697 (*I* > 2σ(*I*)) and wR2 was 0.1869 for compound **6**. A total of 4819 reflections were collected by using ω scan mode for compound **7**, 1795 of which were unique with R*int* = 0.0317 and R*sigma* = 0.0245. The final R<sup>1</sup> was 0.0372 (*I* > *2*σ(*I*)) and wR<sup>2</sup> was 0.0990. The structures of compounds **6** and **7** were solved using the ShelXT structure solution program by Intrinsic Phasing and refined with the ShelXL refinement package via Least Squares minimization, using Olex2 [24–26].

The crystal data and structure refinement details of the compounds **6** and 7 are provided in Table 1. The crystallographic data for compounds **6** and **7** are available from the Cambridge Crystallographic Data Centre (CCDC) (www.ccdc.cam.ac.uk/structures/), with CCDC No. 1878381 and 1870401, respectively.


**Table 1.** Crystal data and structural refinements of compounds **6** and **7**.
