than 3 carbon atoms but not more than 12, then R1 and R2 are from the group consisting of methyl and ethyl; and if R1 and R2 are joined to form a ring compound, R3 is an alkyl group not greater than ethyl and wherein the concentration of gum in the composition is in the range of 0.7 to 3 percent by weight and the concentration of starch in the composition is in the range of 12 to 16 percent by we