17-1; 2c, 128114-75-0; 3c, 128114-76-1; 4, 128114-77-2; 5, 128114-78-3; 6, 128114-79-4;
9a, 128114-80-7; 9b, 123559-84-2; 9c, 128114-81-8; 10, 128114-82-9; 11, 128114-83-0;
12, 128114-84-1; 13, 128114-85-2; 14, 128114-86-3; 2-methyl-3-(phenylsulfonyl)-2, 3-
dihydrothiophene 1, 1-dioxide, 123559-85-3.