Crystal Structure of ?

Id4000987
Chemical name ?
a (Å)5.49945(16)
b (Å)5.42638(18)
c (Å)11.3846(5)
α (°)90.0
β (°)90.0
γ (°)90.0
V (Å3)339.74(2)
Space groupP 21 a m