nmr and natural bond orbital (nbo) calculation of (1s,8ar)-4, -7 dimethyi-1-(propan-2-yl)- 1,2,3,5,6,8a-hexahydronaphthalene and17- bis(4-hydroxy-3-methoxyphenyl)-(1e6e)16-heptadiene-35-dione : nano physical parameter investigation