A real world extensions sequence (taken from Google's GAI2).
$ openssl asn1parse -i < [EXTENSIONS]
0:d=0 hl=3 l= 228 cons: SEQUENCE
3:d=1 hl=2 l= 31 cons: SEQUENCE
5:d=2 hl=2 l= 3 prim: OBJECT :X509v3 Authority Key Identifier
10:d=2 hl=2 l= 24 prim: OCTET STRING [HEX DUMP]:30168014C07A98688D89FBAB05640C117DAA7D65B8CACC4E
36:d=1 hl=2 l= 29 cons: SEQUENCE
38:d=2 hl=2 l= 3 prim: OBJECT :X509v3 Subject Key Identifier
43:d=2 hl=2 l= 22 prim: OCTET STRING [HEX DUMP]:04144ADD06161BBCF668B576F581B6BB621ABA5A812F
67:d=1 hl=2 l= 14 cons: SEQUENCE
69:d=2 hl=2 l= 3 prim: OBJECT :X509v3 Key Usage
74:d=2 hl=2 l= 1 prim: BOOLEAN :255
77:d=2 hl=2 l= 4 prim: OCTET STRING [HEX DUMP]:03020106
83:d=1 hl=2 l= 46 cons: SEQUENCE
85:d=2 hl=2 l= 8 prim: OBJECT :Authority Information Access
95:d=2 hl=2 l= 34 prim: OCTET STRING [HEX DUMP]:3020301E06082B060105050730018612687474703A2F2F672E73796D63642E636F6D
131:d=1 hl=2 l= 18 cons: SEQUENCE
133:d=2 hl=2 l= 3 prim: OBJECT :X509v3 Basic Constraints
138:d=2 hl=2 l= 1 prim: BOOLEAN :255
141:d=2 hl=2 l= 8 prim: OCTET STRING [HEX DUMP]:30060101FF020100
151:d=1 hl=2 l= 53 cons: SEQUENCE
153:d=2 hl=2 l= 3 prim: OBJECT :X509v3 CRL Distribution Points
158:d=2 hl=2 l= 46 prim: OCTET STRING [HEX DUMP]:302C302AA028A0268624687474703A2F2F672E73796D63622E636F6D2F63726C732F6774676C6F62616C2E63726C
206:d=1 hl=2 l= 23 cons: SEQUENCE
208:d=2 hl=2 l= 3 prim: OBJECT :X509v3 Certificate Policies
213:d=2 hl=2 l= 16 prim: OCTET STRING [HEX DUMP]:300E300C060A2B06010401D679020501
-----BEGIN EXTENSIONS-----
MIHkMB8GA1UdIwQYMBaAFMB6mGiNifurBWQMEX2qfWW4ysxOMB0GA1UdDgQWBBRK3QYWG7z2aLV
29YG2u2IaulqBLzAOBgNVHQ8BAf8EBAMCAQYwLgYIKwYBBQUHAQEEIjAgMB4GCCsGAQUFBzABhh
JodHRwOi8vZy5zeW1jZC5jb20wEgYDVR0TAQH/BAgwBgEB/wIBADA1BgNVHR8ELjAsMCqgKKAmh
iRodHRwOi8vZy5zeW1jYi5jb20vY3Jscy9ndGdsb2JhbC5jcmwwFwYDVR0gBBAwDjAMBgorBgEE
AdZ5AgUB
-----END EXTENSIONS-----