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[ÇóÖú] ACTA CÕªÒª½âÎö

The title compound, C21H15N3O3, crystallizes in two polymorphic
forms. In the orthorhombic polymorph, (I), in space
group Fdd2 with Z = 1, the molecules lie in general positionswhile in the monoclinic polymorph, (II), in space group C2/c
with Z = 1
2, the molecules lie across twofold rotation axes. In
each polymorph, the molecules are linked by a single CÐH  
(arene) hydrogen bond, forming chains in polymorph (I) and
sheets in (II)

Ö÷ÒªÊÇÕ⼸¾äÀÍ·³¸ßÊÖ¸ø½âÊÍһϣºÎªÊ²Ã´Ç°Ò»¸öÊÇZ'=1, in general positions£¬ºóÒ»¸öZ'=1/2, lie across twofold rotation axes
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