In this work, we find the asymptotic formulas for sum of negative eigenvalues smaller than ?? (? > 0) a self-adjoint operator L defined by following differential expression ?(y)=?(p(x)y?(x))??Q(x)y(x) with boundary condition y(0) = 0 in space L2(0,?;H).

The less polar fractions of the extract of the aerial parts of Jurinea leptoloba afforded two new elemanolides. The structures were elucidated by high field NMR techniques