The IUPAC name of the structure is

3-amino-2-formyl butane-1, 4-dioic acid
3-amino -2,3-dicarboxy propanal
2-amino -3- formyl butane -1, 4-dioic acid
1-amino -2-formyl succinic acid

Although CHO group is senior than NH2 but after deciding senior most group (COOH) next groups are preferred as alphabatically. So numbering is done from left to right.
Prefix for NH2– group is amino and for CHO – group is formyl.
Example of a gem dihalide is : -
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