Crystal Structure of ?

Id4000989
Chemical name ?
a (Å)5.55375(31)
b (Å)5.49660(31)
c (Å)11.5086(9)
α (°)90.0
β (°)90.0
γ (°)90.0
V (Å3)351.32(4)
Space groupP 21 a m