1) HOC-CH(CH3)-CH(CH3)-CH(CH3)-CH3
2) HOC-CH(CH3)-CH(C2H5)-CH2-CH(CH3)-CH2-CH3
3) HOC-CH(CH3)-CH2-C(CH3)(C2H5)-CH3
1) HOC-CH(CH3)-CH(CH3)-CH(CH3)-CH3
2) HOC-CH(CH3)-CH(C2H5)-CH2-CH(CH3)-CH2-CH3
3) HOC-CH(CH3)-CH2-C(CH3)(C2H5)-CH3