现代无机化学对硫—氮化合物的研究是最为活跃的领域之一。其中下图所示是已合成的最著名的硫—氮化合物的分子结构。
下列说法正确的是
| A．该物质的分子式为SN |
| B．该物质的分子中既有极性键，又有非极性键 |
| C．该物质在固态时形成原子晶体 |
| D．该物质与化合物S2N2互为同素异形体 |
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