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| | Photographic system and novel compounds - Patent 4713313 |
 | | The process as defined in claim 11 wherein R, R.sub.1 and R.sub.2, together with X, form a ##STR19## group, B is methylene, R.sub.3 is hydrogen and n is 1. |
 | | A composition as defined in claim 22 wherein R, R.sub.1 and R.sub.2, together with X, form a ##STR28## group, B is methylene and n is 1. |
 | | A composition as defined in claim 22 wherein R, R.sub.1 and R.sub.2, together with X, form a ##STR29## group, B is methylene and n is 1. |
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