Hi! I've been working on an adventure map for awhile now and I am stuck! I need players to be given a stone pickaxe that, when held in the main hand, gives the mining fatigue attribute! I have read through the wiki and searched all over, but I simply can't get the command to work! Can someone please help me out here? Thanks in advance.

Command I am currently using:

/give @p stone_pickaxe 1 0 {AttributeModifiers;[{Slot:”mainhand”,AttributeName:”effect.digSlowDown”,Name:”effect.digSlowDown”,Amount:1,Operation:2,UUID 55FCED67-E92A-486E-9800-B47F202C4386}]}