Json problem

Original Command:
/summon FallingSand ~ ~1 ~ {Tile:command_block,Block:command_block,TileEntityData:{Command:"execute @p ~ ~ ~ setblock ~-2 ~-1 ~ minecraft:wall_sign 4 replace {Text1:\"{text:\"Hello\",color:gold}\"}"},Time:1}

Summoned Command:
execute @p ~ ~ ~ setblock ~-2 ~-1 ~ minecraft:wall_sign 4 replace {Text1:"{text:"Hello",color:gold}"}