1h benz e isoindole 0 22 g 1 1 mmol were treated by the procedures described in example 3 to yield the title compound 0 11 g 42 as a white solid m p 248 u00b0 250 u00b0 c dec 1 h nmr 500 mhz dmso d 6 u03b4 1 53 1 64 m 1h 1 74 1 83 m 1h 2 38 2 52 m 1h 2 62 2 78 m 2h 2 94 3 06 m 1h 3 28 3 34 m 1h 3 40 3 54 m 3h 3 77 s 3h 3 79 4 03 m 1h 4 08 4 26 m 3h 6 75 bs 1h 6 83 d 1h 7 16 t 1h 7 32 t 1h 7 42 t 2h 7 61 s 1h 7 67 d 2h ms dci nh 3 m e 474 m h anal calcd for c 27 h 27 n 3 o 3 s hcl 0 5 h 2 o c 62 48 h 5 63 n 8 10 found c 62 39 h 5 58 n 8 04 3 amino 4 carboethoxythiophene prepared by the method of baker et al j org chem 18 138 1953 was treated with 0 33 equivalent triphosgene the resulting isocyanate 0 29 g.