PROBLEM TO BE SOLVED: To provide compounds useful in inhibition of lipid kinases including p110 alpha and other isoforms of PI3K and medical treatments of diseases mediated by lipid kinases, e.g. cancer.SOLUTION: Benzoxepin compounds of formula (1), isomers of the compounds (1) and salts of the compounds (1) and isomers are provided. In the formula (1), Zis CRor N; Zis CRor N; Zis CRor N; Zis CRor N; and (i) Xis N or S and Xis S or N, (iii) Xis CRor S and Xis S or CR, (v) Xis NRor N and Xis Ror N, (vii) Xis CRor O and Xis O or CR, (ix) Xis CRor C(R)and Xis C(R)or CR, (xi) Xis N and Xis O, or (xii) Xis O and Xis N.【課題】p110アルファ及びPI3Kの他のアイソフォームを含む脂質キナーゼの阻害、及び脂質キナーゼにより媒介される癌等の疾患の治療に有用である化合物の提供。【解決手段】式1で表わされるベンゾキセピン化合物及びその異性体又はその塩。[Z1がCR1又はN;Z2がCR2又はN;Z3がCR3又はN;Z4がCR4又はN;及び(i)X1がN又はS、X2がS又はN、(iii)X1がCR7又はS、X2がS又はCR7;(v)X1がNR8又はN、X2がNR8又はN、(vii)X1がCR7又はO、X2がO又はCR7、(ix)X1がCR7又はC(R7)2、X2がC(R7)2又はCR7;(xi)X1がN及びX2がO、又は(xii)X1がO及びX2がN]【選択図】なし