Effect of cooling temperature on recrystallization yield^a.

Entry	Temperature/°C	Yield (%)
1	5	—b
2	10	—b
3	15	27.1
4	20	38.4
5	25	50.4
6	30	52.2
7	35	48.1

^aReaction conditions: impurity-containing S₄N₄ was dissolved by stirring with benzene, and the saturated solution was heated to 80 °C before cooling.

^bNo expected product was obtained.